How to fix error:Error using imread>get_full_filename (line 570) File "i,m" does not exist?

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yasmin ismail 2023-10-11

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评论： yasmin ismail 2023-10-20

I used pixel label from image labeler App.There is a menu 'Export Labels > To File' in the Image Labeler App and it generates a new folder called <PixelLabelData> containing PNG label files. Then I opened the file which created called PixelLabeData and I found the labeled image is totally black(label_1.png) I apllied the followig code to display it :

figure;

[i, m] = imread('Label_1.png');

imshow(i,m)

Then, I applied jaccrad index:

A = logical(imread('7001-236.png'));

BW_groundTruth =logical(imread('i,m'));

similarity = jaccard(squeeze(A(:,:,1)), BW_groundTruth)

I got the following error:

Error using imread>get_full_filename (line 570)

File "i,m" does not exist.

Error in imread (line 377)

fullname = get_full_filename(filename);

Error in Untitled_ask (line 8)

BW_groundTruth =logical(imread('i,m'));

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Mathieu NOE 2023-10-12

编辑：Mathieu NOE 2023-10-12

hello again

1/ when I read your posted images I got the same size (309 x 310)

I haven't made any resize operation

so m and n are the rows and columns of your images (and are identical for both of them) , and the number of pixels is simply the product m*n of course

2/ cannot answer this as I cannot run your code as I don't have access to the jaccard function. But I recognize that such a low similarity value seems indeed strange but maybe it's simply because I have not yet understood the jaccard concept ! I need more time

3/ my approach was rather simple , maybe pictures would explain better than a long text :

here from left to right the 3 plots of some of our data :

>> figure(1),imagesc(AA)

>> figure(2),imagesc(BW_groundTruth)

>> figure(3),imagesc(ind)

what we see on the right (fig 3) in yellow (value = 1 logical) is pixels of the two images that are either both black or both white

the only logical zeros (blue) on this 3rd figure are pixels that are black in one image and white in the other

my similarity index (if we can use that definition) is simply the ratio of how many common pixels are indentified vs the total (same) number of pixels in both images. Anyway, you can do my computation only if both images have exact same size. i haven't checked if the jaccard function works on dissimilar size of images (have to look at the doc)

Mathieu NOE 2023-10-20

@yasmin ismail

tx but I don't have the Image Processing Tbx , so I probably will never use the native jaccard function . is there a Fex alternative ? I haven't seen one for the time being

yasmin ismail 2023-10-20

@Mathieu NOE there is another method to measure similarity like (ssim) ,but the common is jaccrad(IoU) index

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回答（1 个）

Torsten 2023-10-11

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移动：Torsten 2023-10-11

在 MATLAB Online 中打开

BW_groundTruth =logical(i);

instead of

BW_groundTruth =logical(imread('i,m'));

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yasmin ismail 2023-10-11

i.png

@Torsten the result is strange=.09 it seems the function read again the black image (Label_1.png),

if you use imshow(i,m) (I have atached it with name i.png) you will see the labled pixel wich very similar to image 7001-236.png, that mean it should give higher similarity. How to fix it?

Walter Roberson 2023-10-11

imshow(i,m) is a request to display the content of the variable i using m as a scaling range if m is a vector of length 2, or using m as a colormap. Unless, that is, i is a character vector or string scalar in which case i holds the name of a file to read and display.

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